Plaster-cast saw



Sept. 6, 1927.

1,641,505 D. G. SAYRE PLASTER CAST SAW Filed Dec. 16, 1925 PatentedSept. 6, 1927.

UNITED STATES- DUANE G. SA YRE, OF MEADVILLE, YENN SYLVANIA.

PLASTER-CAST SAW;

Application filed December My present invention has to do with theremoval of plaster cast from patients, and it relates more especially towhat are known as plaster cast saws designed and adapted 5 for thecutting and removal of plaster cast.

from patients.

One of the objects of my invention is the provision of an advantageousorganized mechanism adapted to be handled and regu- Wlated or-controlledwith facility so as to effectively remove a plaster cast withoutliability of injuring a patient or subjectlng him to discomfort.

Another object of.the invention is to provide a device of the kindindicated embodyingsawing means, and guard means complementary to thesawing means and through the medium of which the depth of cut may beregulating and the making of an unduly deep cut obviated.

Other objects and practical advantages of the invention will be fullyunderstood from the following description and claims when the same areread in connection with the drawings, accompanying and forming. part ofthis specification, in wh1ch:-

Figure 1 is a view in elevation illustrating one end portion of aplaster cast saw constituting the preferred embodiment of my inventionand one which has been sucoessfully used.

Figure 2 is an end elevatlon of the device illustrative of the sawmeans, the guard complementary to said saw means, and the means foradjusting and adjustably fixing the guard.

Similar numerals of reference designate corresponding parts in bothviews of the drawings.

Among other elements my novel apparatus comprises an electric motor 1,and 1n the actual reduction of my invention to practice hereinbeforereferred to the said motor is equipped at its back with a handleincluding a bail and a hand grasp interposed be- -tween the ends of thebail. I have, however, deemed itunnecessary to illustrate the saidhandle.

In addition to the electric motor 1 my novel apparatus includes aframedisposed at the opposite side of the electric motor, with referenceto the handle alluded to. The said frame is made up of a head 2immediately adjacent and fixed, to the casing of the electric motor, ahead 3 spaced from the head 2 and remote from the said electric 16,1925. Serial No. 75,788.

.motor, and struts 4 interposed between the said'heads 2 and 3 andfunctioning to maintain the said heads in spaced relation and fixed withrespect to each other. The armature shaft of-the motor l is designatedby 5, and parallel to the said armature shaft 5 is an arbor 6 which maybe and preferably is connected with the armature shaft by conventionalreducin gears located 1n a casing 7.-\ At 8 is a chuc and at 9 is anappurtenance mounted on the struts 4 and adapted to serve a purposehere-1 inafter referred to.

The head 3 is formed by two parallel plates 10, preferably of theconfiguration best shown In Figure 2, and between the said plates 10 arelocated and adapted to oper- I ate the saws 11 which are appropriatelyfixed on the arbor 6 andare spaced apart in par allelism as illustrated.Hingedly connected at 12 to the head plates 10 is the saw guard whichconstitutes an important feature of my invention, The said guard isprovided with parallel slots l lforthe projection and play of the'saws,and connected to the free portion of the guard'13 in swivelled manner isan adjusting or regulating screw 14 which is threaded through a bearing15 carried by the head plates 10, and is equipped, by preference, with aknurled-head 16. Manifestly by adjusting the screw 14 the guard lfitmaybe positioned so that more or less of the saw blades or saws may beprojectedbeyondthe guard 13 for sawing or cutting purposes. It will alsobe appreciated that by positioning the guard 13 and adjustably fixingthe same as conditions require, the depths of the cuts made by the sawsmay be increased or diminished as occasion demands, and in all cases theguard l3 may be so set as to preclude the possibility of the sawscutting or rendering a patient uncomfortable.

Notwithstanding the practical advantages ascribed to my improvement, itwill be appreciated that the improvement is simple and inexpensive inconstruction, is adapted to be readily handled and operated, and is notliable to get out of order after a short period of use.

I have specifically described thepresent and preferred embodiment of myinvention in order to impart a full, clear and exact understanding ofthe said embodiment. I do not desire, however, to be understood asconfining myself to the specific construction and relative arrangementof the parts as disclosed, my invention being defined by my appendedclaims within the scope of whichchangesin structure and arrangement maybe madewithout'departure from my invention." J

Having described my invention, what I claim and desire to secure byLetters-Pat ent, is 1- y p 1. A plaster cast saw of the class describedincluding a frame having a head adapted to be attached-to a. motor and asecond head spaced from the first head, means connecting the heads andmaintaining the same in spaced relation, an arbor mounted in the firsthead to extend between the two heads,

' saw means carried by and driven through said arbor, said second headincluding a pair 0f parallel spa'ced plates between which the saw meansis located, a guard pivotally mounted at one end between adjacent endsof the platesand having a. slot through which the saw means may extend,a pivoted mem-v ber mounted between the other ends of the plates, andascrew swivelly mounted at the free end of the guard. and threadedthrough the pivoted member.

2. A plaster cast saw of the class described including in combination, aplate adapted.

to be fixed to a motor housin an arbor mounted in the plate and adaptedto be opera'bly associated with the armature shaft of the motor, strutsprojecting frbm the plate, a pair of plates mounted inspaced relation toeach other on the extremities of the struts,

a guard plate pivotally' mounted onone end on one of the struts betweenthe'pair of plates, a member mounted on the other strut

